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Skin biopsy from a scaly papule can be diagnostic. Pityriasis lichenoides chronica is an uncommon, idiopathic , acquired dermatosis , characterized by evolving groups of erythematous , scaly papules that may persist for months.
Lichen simplex chronicus (LSC) is thick leathery skin with exaggerated skin markings caused by sudden itching and excessive rubbing and scratching. [1] It generally results in small bumps, patches, scratch marks and scale. [1] It typically affects the neck, scalp, upper eyelids, ears, palms, soles, ankles, wrists, genital areas and bottom. [1]
For pityriasis lichenoides, a skin biopsy followed by a histopathologic examination is a confirmatory procedure. Histologically, interface dermatitis with a noticeable lymphocytic infiltrate is the hallmark of pityriasis lichenoides. [2]
What it looks like: Like seborrheic dermatitis, perioral dermatitis causes red, inflamed skin and small pustules around the nose and mouth. Other symptoms to note : Flare-ups can be itchy and ...
“Seborrheic dermatitis is a common scalp condition caused by overgrowth of microorganisms such as Pityrosporum and Malassezia,” Dr. Thosani says. Severe itching from dandruff can cause scabs ...
Interface dermatitis with lichenoid inflammation, not otherwise specified, can be caused by lichen planus-like keratosis, lichenoid actinic keratosis, lichenoid lupus erythematosus, lichenoid GVHD (chronic GVHD), pigmented purpuric dermatosis, pityriasis rosea, and pityriasis lichenoides chronica. [2]
The exact cause of erosive pustular dermatitis of the scalp is unknown. Risk factors include actinic damage, epidermal atrophy, topical drugs and agent, surgery, and infections. Trauma and tissue injury are other potential triggers. A skin biopsy can be used to help rule out potential differential diagnoses but histopathology is unspecific.
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